Something doesnt make sense about this. I dont get what the difference between the 3 month and 6 month packages are. And the whole deal seems like there must be a catch. But for $0 I will buy it and decide between now and August if I want to do it. I currently have Fios and I was considering switching anyway

It's an introductory package to get you to switch. Then you stay and keep paying usurious monthly fees.